Improvement in rotary steam-engines



J.S. HEWITT; Rotary Steam-Engines.

atented Jan. 29, I878.

WM. m H A U IT D STATES PATENT OFFICE;

'J'o'rin s. HEWITT, on WHEATLAND, MISSOURI.

IMPROVEMENT IN ROTARY STEAM-ENGINES.

Specification forming part'of Letters Patent No. 199,709, dated January 29, 1878; applio tion filed August 11, 1877.

Toall whom it may concern:

Be it known that I, JOHN S. HEWITT, of

Wheatland, in the county of Hickory and- State of Missouri, have invented a new and Improved Rotary Engine, of which the following is a specification:

Figure 1 is a side elevation, partly in section. Fig. 2 is a plan view in section on line 00 an in Fig. 1.

Similar letters of reference indicate corresponding parts.

The object of my invention is to construct a rotary engine, which shall be compact, powerful, and economical in the use of steam.

In the drawing, A is a frame, which supports the engine-cylinder B, and in which the shaft 0 is journaled. The cylinder consists of two annular plates, D, that are secured to the posts A of the firame A, and are recessed .bolts e, and their inner edges are prevented from being forced outward by the pressure of steam by yokes or levers F that are arranged in pairs, and are pivoted in opposite ends of the bolts f that extend through the cylinder. These levers are arranged radially on the cylinder, and their inner ends rest upon the plates D, near their inner edges, and their outer ends rest upon nuts g, placed on bolts h, having right and left threads on opposite ends.

A double wrench, 'i, is provided for operating the nuts on both ends of the bolts simultaneously. By turning the nuts g, the outer ends of the levers F are forced outward laterally, causing their inner ends to bear upon the surface of the annular plate D, near its inner edge.

Ports k k are formed in the upper portion of the cylinder, and are connected by short pipes, l, with valve-chests m m, which contain the ports n o and valves 19.

The ports 0 are connected with the exhaustreceiver q, and the ports a are connected, by

pipes 1', with the ports 8 s of the valve-chest v t, in which chest there is a valve, a, which is capable of covering either of the ports 8 s. The valves 10 may in like manner cover either of the ports n 0.

A supply-steam pipe, G, in which there is a throttle-valve, H, is connected with the steamchest 13.

Upon the stem of the valve u there is a double pulley, and upon the stem of each valve 19 there is a pulley, c, that is. connected with the double pulley on the valve-stem a by a belt, so that by turning the stem of the valve to thevalves p are also turned.

Steam is admitted to the valve-chest tthrough the pipe Gr, and passes to one of the chests m m through the connecting-pipe r. In the drawing the valve it covers the port 8, and steam passes through the port 8, pipe r, and port a, to the chest m, whence it passes through the pipe land port is to the chambers or buckets b, and propels the wheel forward, a small leakage of steam being permitted to allow steam to passfrom one bucket toanother. The steam is carried around by the buckets and is discharged through the port 70, pipe I, chest m, and port 0, into the exhaust-receiver q.

The engine is reversed by turning the valve u, so that it covers the port 8. The valves p are .i turned by means of their connection with the valve u, the valve in the chest m being turned so as to cover the port at and open the port 0, the valve in the chest m being turned so as to close the port 0 and open the port a. When the valves are so arranged steam is admitted to the cylinders through the port k, and exhausted through the port 10. v

Having thus described my invention, I claim as new and desire to secure by Letters Pat '3. The steam-chests m m t, valves to p, pipes I ent- "r, and exhaust-receiver q, in combination with 1. The annular plates D, having the ports the casing D and Wheel E, substantially as 70%, the aisgn-disfilfl, ga ving bgeketts b, anbd shown and described. r1 so an e pac ng lncom ma 1011,811 stantially as shown and described. 1 JOHN HEWITT 2. The levers F, bolts f, bolts h, having Witnesses: nuts g, and the annular plates D, in 'combina- M. HENRY'MOORE, tion, substantially as shown and described. PHILIP L. HARGISS. 

